Citadel should be configured for mail groupware service integrity and protocol-level security controls.
CITADEL_URL=https://citadel.example.com
CITADEL_IMAP_PORT=993
CITADEL_SMTP_PORT=587
CITADEL_DB_PATH=/var/lib/citadel
CITADEL_DOMAIN=example.com
CITADEL_TLS=true
Back up metadata databases, file/message stores, and integration/secrets metadata. Validate restore with one login, one collaboration action, and one message or calendar synchronization check.
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